<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.$store.state.city}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div 
          class="button-wrapper" 
          v-for="item of hotCitys" 
          :key="item.id"
          @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div 
      class="area" 
      v-for="(item, key) of citys" 
      :key="key"
      :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div 
            class="item border-bottom" 
            v-for="innerItem of item" 
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)"
            >
              {{innerItem.name}}
            </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapState, mapMutations } from 'vuex'
import Bscroll from 'better-scroll'
export default {
  name: 'CityList',
  props: {
    citys: Object,
    hotCitys: Array,
    lettr: String
  },
  methods: {
    handleCityClick (cityName) {
      // 将城市名字 通过vuex de dispatch 派发出去 在 vuex 的action里接收
         //this.$store.dispatch("changeCity", cityName)
      // 如果没有异步操作 逻辑简单 直接调用  mutations里的 commit
      //this.$store.commit("changeCity", cityName)
      this.changeCity(cityName) // changeCity已经呗映射到 mutations 里直接调用
      this.$router.push("/")
      
    },
    
    // 将changeCity 映射到 mutations 
    ...mapMutations(['changeCity'])
   
  },
  computed: {

    // 将vuex 里的数据 映射到 计算属性里  映射的city 
    ...mapState(['city'])
  },
  // 侦听器 
  watch: {
    lettr () {
      if(this.lettr){
        console.log(this.lettr,"list")
        // 获取 页面帮定的 ref
        const element = this.$refs[this.lettr][0]
       //scroll.scrollToElement(element) 自动滚动到那个元素上 
       // === better-scroll 提供
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    //  配置 bscroll click 事件有效
    this.scroll = new Bscroll(this.$refs.wrapper,{click: true})
  }

}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>